document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=93974>Question 93974</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I do not get how to do this nor which of the two formulas below that it needs to be done in. I tried it in both, and could not get it to work as I thought it would. \r<BR>\n" );
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document.write( "In 1975 the population of the Earth was approximately 4 billion and doubling every 35 years. The formula for the population P in year Y for this doubling rate is P (in billions) = 4 &#8729;2^((y-1975)/35)\r<BR>\n" );
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document.write( "The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United States then becomes <BR>\n" );
document.write( "P (in millions) = 250 &#8729;2^((y-1990)/66)\r<BR>\n" );
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document.write( "#82.  Social science. What will the population of the United States be in 2025 if this growth rate continues?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #68460 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=68460\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the question says \"United States\" so the second formula applies ... P=250*2^((2025-1990)/66)\r<BR>\n" );
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document.write( "P=250*2^(35/66) ... P=361.06 </SPAN>\n" );
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